JP2007275253A - Golf club head - Google Patents

Golf club head Download PDF

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Publication number
JP2007275253A
JP2007275253A JP2006104458A JP2006104458A JP2007275253A JP 2007275253 A JP2007275253 A JP 2007275253A JP 2006104458 A JP2006104458 A JP 2006104458A JP 2006104458 A JP2006104458 A JP 2006104458A JP 2007275253 A JP2007275253 A JP 2007275253A
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JP
Japan
Prior art keywords
portion
concave
groove
weight member
club head
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Granted
Application number
JP2006104458A
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Japanese (ja)
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JP4326540B2 (en
Inventor
Masatoshi Yokota
政利 横田
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Sri Sports Ltd
Sriスポーツ株式会社
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Priority to JP2006104458A priority Critical patent/JP4326540B2/en
Publication of JP2007275253A publication Critical patent/JP2007275253A/en
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Publication of JP4326540B2 publication Critical patent/JP4326540B2/en
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    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63BAPPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00Golf clubs
    • A63B53/04Heads
    • A63B53/0466Heads wood-type
    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63BAPPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B60/00Details or accessories of golf clubs, bats, rackets or the like
    • A63B60/02Ballast means for adjusting the centre of mass
    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63BAPPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B60/00Details or accessories of golf clubs, bats, rackets or the like
    • A63B60/52Details or accessories of golf clubs, bats, rackets or the like with slits
    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63BAPPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00Golf clubs
    • A63B53/04Heads
    • A63B2053/0408Heads with defined dimensions
    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63BAPPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00Golf clubs
    • A63B53/04Heads
    • A63B2053/0433Heads with special sole configurations
    • AHUMAN NECESSITIES
    • A63SPORTS; GAMES; AMUSEMENTS
    • A63BAPPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B53/00Golf clubs
    • A63B53/04Heads
    • A63B2053/0491Heads with added weights, e.g. changeable, replaceable

Abstract

<P>PROBLEM TO BE SOLVED: To provide a golf club head where a weight member in a sole part is prevented from falling out. <P>SOLUTION: The golf club head includes the sole part 5 forming the bottom surface of the head, and is provided with a hollow part inside. The sole part 5 is provided with: a recessed part 8 for fixing the weight member recessed to the side of the hollow part; and the weight member 9 fixed to the recessed part 8. Moreover, a reinforcing recess groove 10 extending in a recess part periphery area Z within 10 mm from the recessed part 8 is provided. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a golf club head, and more particularly to a golf club head that can effectively prevent the weight member from coming off while adjusting the position of the center of gravity of the head by fixing a weight member to a sole portion.

  In recent years, various golf club heads in which a weight member is fixed to a sole portion have been proposed in order to set the center of gravity of the head at a lower position, for example (see Patent Document 1 below).

  By the way, in a shell-like golf club head having a hollow portion therein, each part of the club head is likely to vibrate when hitting a ball, and in particular, a weight which is a heavy object in a sole portion having a relatively large area in the head If the member is provided, the weight member tends to vibrate greatly. Such vibration that is always generated by repeated hitting has a problem in that the joint portion between the weight member and the head main body is fatigued, and as a result, the weight member is detached and the joint portion is cracked.

JP 2004-121362 A

  The present invention has been devised in view of the above circumstances, and a weight member is fixed to the sole portion, and at least one concave groove is provided in a peripheral region of the concave portion for disposing the weight member. Basically, the main object is to provide a golf club head capable of suppressing the vibration at the time of hitting by increasing the rigidity of the peripheral area of the recess and thus effectively preventing the weight member from coming off.

  The invention according to claim 1 of the present invention includes a face portion having a face for hitting a ball on the front surface, a sole portion connected to the lower edge of the face and forming a bottom surface of the head, and a hollow portion is provided inside. In the golf club head according to the present invention, the sole portion is provided with a concave portion for fixing the weight member recessed to the hollow portion side, and a weight member fixed to the concave portion, and within 10 mm from the concave portion. Reinforcing grooves extending in the peripheral area of the recess are provided.

  According to a second aspect of the present invention, in the golf club head according to the first aspect of the present invention, the concave groove is provided separately from the concave portion without communicating with the concave portion.

  According to a third aspect of the present invention, in the golf club head according to the second aspect, the shortest separation distance between the concave portion and the concave groove is 1.0 to 10.0 mm.

  According to a fourth aspect of the present invention, in the golf club head according to the second or third aspect, the shortest separation distance between the weight member and the concave groove is 1.0 to 10.0 mm.

  According to a fifth aspect of the present invention, the concave groove includes at least a first concave groove and a second concave groove, and in a reference state in which the head is grounded to a horizontal plane at a specified lie angle and loft angle. A straight line connecting a first proximity point that is the closest position to the concave portion of the first concave groove and a second proximity point that is the closest position to the concave portion of the second concave groove. 5. The golf club head according to claim 1, wherein the projected straight line projected onto the horizontal plane intersects with a projected weight member that projects the weight member onto the horizontal plane.

  According to a sixth aspect of the present invention, the concave groove has a groove length measured along the groove center line of 15 mm or more and an opening width of 1 to 10 mm. The golf club head.

  According to a seventh aspect of the invention, the concave portion is a circular hole, and a tapered hole portion extending toward the hollow portion side while the inner diameter gradually decreases from the outer surface of the sole portion, and is substantially continuous to the tapered hole portion. The same-diameter hole portion having the same inner diameter and the screw-hole portion connected to the same-diameter hole portion and having a thread groove having a smaller diameter than the inner diameter of the same-diameter hole portion are coaxially provided. The weight member includes a screw shaft portion screwed into the screw hole portion, and a head portion having an outer diameter that is connected to the screw shaft portion and engages with a step between the same-diameter hole portion and the screw hole portion. The golf club head according to any one of claims 1 to 6, wherein the head is housed on the hollow portion side of the outer surface of the sole portion.

  The golf club head of the present invention is provided with a concave portion for fixing a weight member recessed to the hollow portion side and a weight member fixed to the concave portion in the sole portion, and a concave peripheral region within 10 mm from the concave portion. An extending reinforcing groove is provided. Such a concave groove effectively increases the rigidity of the peripheral region of the concave portion and reduces vibration at the time of hitting the portion. As a result, it is possible to prevent the weight member from coming off and the concave portion from being cracked.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a golf club head (hereinafter simply referred to as “head” or “club head”) 1 of the present embodiment placed in a reference state, FIG. 2 is a plan view thereof, and FIG. 4 is a side view as seen from the toe side, FIG. 4 is a bottom view of FIG. 1, and FIGS. 5A and 5B are sectional views taken along lines AA and BB in FIG. 4, respectively.

  The club head 1 includes a face portion 3 having a face 2 which is a surface for hitting a ball, a crown portion 4 which is continuous with the upper edge 2a of the face 2 and forms an upper surface of the head 2, and a head which is continuous with the lower edge 2b of the face 2. Between the sole portion 5 forming the bottom surface and the crown portion 4 and the sole portion 5, the toe side edge 2 c of the face 2 passes through the back face (surface facing away from the face 2) BF and reaches the heel side edge 2 d. The side part 6 which extends and the hosel part 7 which has the shaft insertion hole 7a provided in the heel side of the crown part 4 and in which a shaft (not shown) is inserted are provided.

  As shown in FIG. 2, the club head 1 has a hollow structure in which a hollow portion i is provided, and is preferably formed as a wood type such as a driver (# 1) or a fairway wood.

  As shown in FIG. 2, the reference state of the club head 1 means that the axial center line CL of the shaft insertion hole 7a is arranged in an arbitrary vertical plane VP and its lie angle with respect to the horizontal plane HP. And the face 2 is tilted with respect to the vertical plane VP at the loft angle (“real loft angle”, the same shall apply hereinafter) to bring the head 1 into contact with the horizontal plane HP. Unless otherwise specified in the present specification, the head 1 is described as being in this reference state.

  Further, as shown in FIG. 2, the head longitudinal direction is defined as a direction Y parallel to a straight line obtained by projecting a normal line N raised from the head center of gravity G to the face 2 onto the horizontal plane HP, and from a certain arbitrary position. As the relative components, the face 2 side is defined as the front or front side, and the back face BF side is defined as the rear or rear side. The intersection SS between the normal N and the face 2 is defined as a sweet spot.

The club head 1 has, for example, and preferably 350 cm 3 or more, more preferably 380 cm 3 or more by volume. Such a large volume is useful for deepening the moment of inertia of the head 1 and the center of gravity G of the head. On the other hand, it is too the volume of the club head 1 is large, the increase in head weight, because of a problem such as deterioration and golf rule violation swing balance, preferably 460 cm 3 or less.

  Further, the total weight of the club head 1 can be arbitrarily determined. For example, it is preferably 180 g or more and 210 g or less. If the total weight of the club head 1 is too small, the weight of the head becomes difficult to be felt during the swing, so that the timing is difficult to take and the resilience performance tends to be lowered. On the other hand, if the total weight of the head becomes too large, the club cannot be shaken and the flight distance and directionality of the hit ball tend to deteriorate.

  Moreover, the club head 1 of this embodiment is comprised from the head main body 1A and the weight member 9, as FIG. 4 shows.

  The head main body 1 </ b> A includes the face portion 3, the crown portion 4, the side portion 6, and the hosel portion 7, and a sole base portion 5 a that forms a main portion of the sole portion 5. The metal material forming the head main body 1A is not particularly limited, but one or more metal materials such as stainless steel, maraging steel, titanium, titanium alloy, aluminum alloy, magnesium alloy, or amorphous alloy are desirable. . These are formed by joining a plurality of parts obtained by forging, casting, pressing or the like. However, a non-metallic material such as a fiber reinforced resin may be used for a part of the head main body 1A.

  Further, the specific gravity of the material constituting the head body 1A (in the case of two or more materials, the average specific gravity weighted by the volume ratio) is not particularly limited, but if it is too large, the head weight may be significantly increased. In order to prevent this, the head volume must be reduced. From such a viewpoint, the specific gravity of the head main body 1A is preferably 7.0 or less, more preferably 6.0 or less, and still more preferably 5.0 or less. The lower limit of the specific gravity of the head main body 1A is not particularly limited, but is preferably 3.0 or more, more preferably 4.0 or more in order to ensure the basic strength of the club head.

  As shown in FIGS. 4 and 5, the sole portion 5 includes a sole base portion 5 a included in the head body 1 </ b> A and a weight member 9. The sole base 5a includes at least one recess 8 for disposing the weight member that is recessed toward the hollow portion i, and at least one that reinforces the recess peripheral region Z by extending the recess peripheral region Z within 10 mm from the recess 8. And a concave groove 10 for reinforcement.

  The weight member-providing recess (hereinafter sometimes simply referred to as “recess”) 8 is, for example, a circular hole, and penetrates the sole portion 5 in this embodiment. However, it goes without saying that the recess 8 may be a bottomed hole.

  The concave portion 8 of the present embodiment includes a tapered hole portion 8a extending toward the hollow portion i while gradually reducing the inner diameter from the outer surface 5S of the sole portion 5, and the tapered hole portion 8a connected to the tapered hole portion 8a. The same-diameter hole portion 8b having an inner diameter substantially the same as the minimum inner diameter and extending to the hollow portion i side, and a mountain diameter continuous to the same-diameter hole portion 8b and smaller than the same-diameter hole portion 8b A screw hole portion 8c in which a screw groove is formed is provided coaxially. Therefore, the recessed part 8 of this embodiment is formed so that the internal diameter becomes large toward the outer surface 5S of the sole part 5 from the hollow part i side. Note that the axis of the recess 8 extends in a substantially vertical direction.

  Further, in this embodiment, the weight member 9 fixed to the concave portion 8 includes a screw shaft portion 9a that is screwed into the screw hole portion 8c, and a mountain diameter of the screw shaft portion 9a that is connected to the screw shaft portion 9a. And a head portion 9b having a larger outer diameter. However, the outer diameter of the head portion 9b is smaller than the minimum inner diameter of the tapered hole portion 8a.

  Such a weight member 9 can be inserted into the concave portion 8 from the outer surface 5S side of the sole portion 5, and the screw shaft portion 9a can be screwed into the screw hole portion 8c. By this screwing, the head portion 9b of the weight member 9 is engaged with the step portion between the screw hole portion 8c and the hole portion 8b having the same diameter, and the weight member 9 is firmly fixed to the concave portion 8. Further, the head 9b of the weight member 9 is provided with a groove or a recess (not shown) for screwing or loosening the weight member 9 by inserting a screwdriver or other tools.

  Further, since the concave portion 8 is provided with the tapered hole portion 8a, the weight member 9 is easily guided and attached into the concave portion 8 while being in contact with the tapered hole portion 8a. Therefore, productivity is improved. Further, the tapered hole portion 8a can enhance the peripheral rigidity of the concave portion 8, so that it is useful for suppressing the vibration of the sole portion 5, particularly the vibration of the weight member 9, which occurs at the time of hitting.

  In order to improve the mounting property of the weight member 9, the radius difference r between the maximum radius and the minimum radius of the tapered hole portion 8a is preferably 1.0 mm or more. On the other hand, when the difference r increases, the reinforcing effect around the recesses 8 tends to be reduced, so that it is preferably 3.0 mm or less, more preferably 2.0 mm, and even more preferably 1.5 mm or less.

  Note that the method of fixing the weight member 9 to the recess 8 is not limited to the screw connection as described above, and one or more of various joining methods such as press-fitting, adhesion, caulking, or welding if possible are used. Can be used.

  As shown in FIG. 5A, it is desirable that the head portion 9b of the weight member 9 is accommodated closer to the hollow portion i than the outer surface 5S of the sole base portion 5a of the head body 1A. That is, it is desirable that the outer surface 9bs of the head portion 9b of the weight member 9 is provided at a position recessed toward the hollow portion i with a distance S (> 0) from the outer surface 5S. Thereby, at the time of a swing, the contact of the weight member 9 to the ground can be prevented, and as a result, damage or detachment of the weight member 9 can be suppressed. Here, if the distance S is too small, the effect cannot be expected sufficiently. Therefore, the distance S is preferably 1.0 mm or more. On the other hand, if the distance S is too large, earth and sand or turf is likely to be clogged in the space of the tapered hole portion 8a and the appearance of the club head 1 may be impaired.

  The weight member 9 is made of a material having a specific gravity greater than that of the head body 1A. Thereby, the center of gravity G of the head is provided at a lower position, and as a result, the height of the sweet spot SS is reduced. Such a club head 1 makes it easy to hit the ball above the sweet spot SS of the face 2, and as a result, a vertical gear effect acts on the ball, the launch angle is large, and the backspin amount is small. An ideal trajectory for improving the flight distance can be obtained. Further, since the weight member 9 of the present embodiment is fixed to the sole base portion 5a with the head portion 9b having a large outer diameter facing down, the center of gravity of the weight member 9 itself is provided below, and the low center of gravity of the club head 1 is provided. Can be realized effectively.

  The specific gravity of the weight member 9 is not particularly limited, but if it is too small, the head center of gravity G tends not to be lowered efficiently, for example, the weight member 9 must be considerably enlarged in order to obtain a necessary weight. There is. From such a viewpoint, the specific gravity is preferably 8.0 or more, more preferably 10.0 or more, and further preferably 15.0 or more. On the other hand, even if the specific gravity of the weight member 9 is too large, there is a risk that the material cost and the like will increase and the productivity will deteriorate, so the upper limit is preferably suppressed to 25.0 or less, for example. As the material of the weight member 9, one or two or more alloys such as copper, copper alloy, tungsten, tungsten alloy, or brass can be adopted, and among them, a tungsten-nickel alloy having a higher specific gravity is preferable.

  The position where the weight member 9 is provided is not particularly limited as long as it is the sole portion 5. Therefore, it can be appropriately provided at a position suitable for the intended center of gravity design. As an example, in the bottom view of the head, the head length L, which is the length in the head front-rear direction of the leading edge FE located at the foremost side and the back edge BE located at the most rear side, and the weight member from the leading edge FE It is desirable that the ratio (WG / L) with the length WG in the front-rear direction of the head to the center of gravity WG is 0.5 or more, more preferably 0.6 or more. This is preferable in that the center of gravity G of the head is positioned further to the rear of the head, and the depth of the center of gravity is increased to improve the directional stability of the hit ball.

  Further, at least a part of the reinforcing concave groove 10 (hereinafter simply referred to as “concave groove”) 10 is included in the concave peripheral region Z. In the present embodiment, since the recess 8 is a circular hole, the recess peripheral area Z is concentric with the contour circle of the recess 8 (the contour circle formed by the maximum outer diameter of the tapered hole portion 8a) and has a radius 10 mm larger than that. It is defined as a region (including a line) surrounded by a virtual circle.

  Further, the concave groove 10 must be capable of reinforcing the rigidity of the region Z by extending the peripheral region Z of the concave portion. For this purpose, as shown in FIG. 6A, which is a sectional view taken along the line CC of FIG. 4, the thickness ts of each part of the groove 10 is at least the thickness ts of the sole base 5a other than the groove 10. Must be substantially the same or larger. Here, the thickness tg of the concave groove 10 is, for example, 0.5 mm or more, preferably 0.8 mm or more, and more preferably 1.0 mm or more in order to ensure sufficient strength. The upper limit of the thickness tg is preferably 2.0 mm or less in order to ensure a weight margin of the weight member. In the present embodiment, an aspect of substantially tg = ts is shown.

  Such a concave groove 10 acts as a so-called reinforcing rib in the peripheral region Z of the concave portion, and can greatly improve its bending rigidity, torsional rigidity, and the like as compared with the case where the area Z is flat. Thereby, the deflection amount and vibration of the recess peripheral region Z at the time of hitting, especially the amplitude of the weight member 9 that easily vibrates because of a heavy object can be suppressed. As a result, the disengagement of the weight member 9 and the crack damage of the concave portion 8 due to fatigue fracture at the joint portion between the weight member 9 and the concave portion 8 can be suppressed over a long period of time.

  For example, as shown in FIG. 6B, the concave groove 10 having a thickness tg smaller than the thickness ts in the concave groove 10 cannot reinforce the rigidity of the sole base portion 5a. Therefore, such a concave groove 10 cannot be said to be a concave groove for reinforcing the concave peripheral region Z. Similarly, when the concave groove 10 is provided at a distance greater than 10 mm from the concave portion 8, the rigidity of the concave peripheral region Z cannot be sufficiently increased.

  Only one concave groove 10 may be provided, or a plurality (two in this example) may be provided as in the present embodiment. The concave groove 10 of the present embodiment includes a toe side concave groove 10 </ b> A provided on the toe side from the concave part 8 and a heel side concave groove 10 </ b> B provided on the heel side from the concave part 8. Each of the concave grooves 10A and 10B has a first end portion 10i existing in the concave portion peripheral region Z and a second end portion 10o existing outside the concave portion peripheral region Z. It is

  The toe-side concave groove 10A extends from the first end 10i provided in the vicinity of the concave portion 8 toward the toe side, and in this example, extends in an arc shape that curves toward the face portion 3 side. Further, the heel-side concave groove 10B extends smoothly from the first end portion 10i provided in the vicinity of the concave portion 8 toward the heel side, and in this example, curves toward the face portion 3 side. It extends in an arc. Such an arc-shaped concave groove 10A is preferable in that the rigidity of the sole base portion 5a can be increased in a wide range. In the present embodiment, the concave grooves 10A and 10B are provided so as to be substantially line symmetric with respect to the head longitudinal direction line passing through the center of gravity WG of the weight member 9 in the bottom view. Such concave grooves 10A and 10B enhance the toe side rigidity and the heel side rigidity of the sole base portion 5a in a well-balanced manner.

  Each first end 10 i is provided without communicating with the recess 8. When the first end portion 10i communicates with the concave portion 8, the strength and rigidity of the communication portion are reduced depending on the depth of the concave groove 10 and stress concentration is likely to occur there. Therefore, although not particularly limited, as a most preferable aspect, it is desirable that the concave groove 10 is provided apart from the concave portion 8 without communicating with the concave portion 8.

  When the concave groove 10 is separated from the concave portion 8, as shown in FIGS. 4 and 5B, the shortest separation distance RL1 between the concave portion 8 and the concave groove 10 is preferably 1.0 mm or more, more preferably 1.5 mm or more, more preferably 2.0 mm or more is effective. The upper limit of the shortest separation distance RL1 is 1.0 mm as described above. In order to further enhance the reinforcing effect of the peripheral area Z of the recess, the upper limit is more preferably 7.0 mm or less, still more preferably 5.0 mm or more. Preferably it is 3.0 mm or less.

  From the same viewpoint, the shortest separation distance RL2 between the weight member 9 and the concave groove 10 is preferably 1.0 mm or more, more preferably 1.5 mm or more, further preferably 2.5 mm or more, and most preferably 3. The upper limit is preferably 5 mm or more, and the upper limit is preferably 10.0 mm or less, more preferably 7.0 mm or less, and still more preferably 5.0 mm or less.

  When a plurality of concave grooves 10 are provided, as shown in an enlarged view in FIG. 7, the first proximity point P1 that is the position closest to the concave portion 8 of the first concave groove 10A, and the second A projection line obtained by projecting the weight member 9 onto the horizontal plane HP is obtained by projecting a straight line M connecting the second proximity point P2, which is the position closest to the recess 8 of the concave groove 10B, onto the horizontal plane HP. It is desirable to cross the weight member. That is, the two concave grooves 10 that satisfy this requirement have the first end portions 10i on both sides of the concave portion 8, so that the rigidity of the peripheral region Z of the concave portion is improved in a well-balanced manner. It can be suppressed over a longer period. Each of the proximity points P1 and P2 is the center position of the width of the communicating portion when the recessed groove 10 communicates with the recessed portion 8. Further, when the concave groove 10 does not communicate with the concave portion 8 and the closest position continues in the groove width direction, the proximity points P1 and P2 are set as intermediate positions in the groove width direction.

  Although not particularly limited, the groove 10 has a groove length measured along the groove center line GCL (shown in FIG. 7) in order to enhance the reinforcing effect of the sole base 5a including the above-described recessed portion peripheral region Z. The thickness is preferably 15 mm or more, more preferably 20 mm or more, and further preferably 25 mm or more. On the other hand, the groove length of the concave groove 10 is not particularly limited, but if it is too large, the effect reaches a peak, and is preferably 70 mm or less, preferably 50 mm or less, more preferably 40 mm or less. Needless to say, the concave groove 10 may be provided on the side portion 6 or the like, for example, with the second end portion 10 o protruding from the sole portion 5.

  Further, as shown in FIG. 6 (A), the opening width GW of the concave groove 10 is not particularly limited, but is preferably 1 mm or more, more preferably 2 mm or more, in order to reinforce the concave peripheral region Z more effectively. The upper limit is preferably 10 mm or less, more preferably 7 mm or less. The opening width GW is measured on the outer surface of the sole portion 5 and is measured in a direction perpendicular to the groove center line GCL.

  Further, the groove depth GD of the concave groove 10 is not particularly limited. However, if it is too small, the reinforcing effect of the peripheral region Z of the concave portion is small. From such a viewpoint, the groove depth GD of the recessed groove 10 is preferably 0.5 mm or more and 2.0 mm or less. The opening width GW and / or the groove depth GD of the concave groove 10 may be constant or may be changed. In the groove 10 of this embodiment, the groove depth GD gradually decreases toward the second end 10o in the vicinity of the second end 10o.

  As shown in FIG. 6 (A), the concave groove 10 of the present embodiment has a substantially flat groove bottom portion 11, and extends from the groove bottom portion 11 in a direction of expanding the groove width. It includes a first groove wall portion 12 on the face portion side and a second groove wall portion 13 on the back face side.

  6A, the angle of the first groove wall portion 12 is represented by an angle θf with respect to the horizontal line (that is, the angle between the horizontal line and the extension line of the groove wall portion 12). Similarly, the angle of the rear groove wall 13 (that is, the angle between the horizontal line and the extension line of the groove wall portion 13) is represented by θb. The angles θf and θb of the groove wall portions 12 and 13 are expressed as acute angles when the angle is other than 90 degrees, and the inclination and 90 degrees for expanding the groove width are expressed as positive.

  The angle θf or θb is preferably 10 degrees or more, more preferably 15 degrees or more, and further preferably 30 degrees or more. When the inclination angle is less than 10 degrees, the effect of reinforcing the recess peripheral region Z may be reduced. The upper limit of the angle θf or θb is preferably less than 90 degrees, and more preferably 80 degrees or less. When the angle is negative, not only is the mud and foreign matter easily clogged in the groove 10, but the second groove wall portion 13 is particularly likely to get caught on the ground when it comes into contact with the ground during swinging, and the swingability is improved. It is easy to get worse. Further, the angle θf or θb may be the same or different.

  In the embodiment shown in FIG. 6, the first groove wall portion 12 has a two-step inclination by including an angle θf1 on the groove bottom side and an angle θf2 on the outer surface side. In the present embodiment, the groove bottom side angle θf1 is formed to be substantially the same as the angle θb of the second groove wall portion 13. On the other hand, the angle θf2 on the outer surface side is formed smaller than the angle θb of the second groove wall portion 12. That is, it is formed by θf1> θf2. Such a groove cross section is desirable in that it can relieve stress concentration in the first groove wall 12 and can effectively prevent breakage at the edge of the groove.

  Moreover, the cross-sectional shape of the concave groove 10 can be variously modified. For example, in FIG. 8A, the first and second groove wall portions 12 and 13 both have an inclination angle θf and θb of substantially 90 degrees. Accordingly, the concave groove 10 has a substantially rectangular groove cross section. Such a ditch | groove 10 can raise the rigidity of the sole part 5 more effectively compared with the aspect of FIG.

  Further, in the embodiment of FIG. 8B, a concave groove 10 having a substantially triangular cross section that tapers toward the hollow portion i is shown.

  Furthermore, in the embodiment of FIG. 8C, the concave groove 10 having a groove cross section in which the angle θb of the second groove wall portion 13 is relatively smaller than the inclination angle θf of the first groove wall portion 12 is shown. Has been. Since the second groove wall portion 13 located on the back face BF side has a small inclination angle θb even when the sole portion 5 comes into contact with the ground during the swing, the concave groove 10 has a small inclination angle θb. Compared with the embodiment, the groove edge of the second groove wall portion 13 is less likely to get caught on the ground, which is preferable in that the swing-out performance is improved.

  Moreover, since the 1st groove wall part 12 has relatively large inclination-angle (theta) compared with the 2nd groove wall part 13, the rigidity of the ditch | groove 10 can be effectively improved compared with the aspect of FIG. . Accordingly, it is possible to provide the concave groove 10 having a good balance. At this time, the difference in inclination angle (θf−θb) is preferably 10 degrees or more, more preferably 20 degrees or more, and the upper limit is preferably 60 degrees or less, more preferably 40 degrees or less, and still more preferably. Is preferably 30 degrees or less.

  FIG. 9 shows another embodiment of the present invention. FIG. 4A is a bottom view of the club head 1 in a reference state, and FIG. 4B is a DD cross-sectional view thereof. In this embodiment, the first end portion 10 i of the recessed groove 10 communicates with the recessed portion 8. The other parts are the same as in FIG. In this embodiment, either end 10i of the two concave grooves 10A and 10B communicates with the concave portion 8, but only one may communicate and the other may be separated.

  FIG. 10 shows a further embodiment of the present invention in which the groove 10 extends substantially in the head front-rear direction. That is, it includes a groove 10C on the face side extending in the head longitudinal direction from the concave portion 8 and a groove 10D in the back face side extending in the longitudinal direction of the head from the concave portion 8 on the back face BF side. Further, the concave grooves 10C and 10D of this embodiment are arranged so as to be substantially continuous with the concave portion 8 interposed therebetween.

  In FIG. 11, as still another embodiment of the present invention, a concave groove 10 </ b> C is provided on the face side where the concave groove 10 extends in a direction substantially perpendicular to the longitudinal direction of the head. In this embodiment, a substantially middle portion of the recessed groove 10C extends in the recessed portion peripheral region Z, and an end portion thereof is provided outside the recessed portion peripheral region Z. Even with such a configuration, the rigidity of the recess peripheral region Z can be increased.

  Although the embodiments of the present invention have been described above, the present invention can be implemented with various modifications. For example, as long as it has a hollow portion inside, it can be applied to various types of heads such as iron type, utility type, and putter type.

Golf club heads in which only the shape of the concave grooves were made were prototyped, and golf balls were actually hit with them to test whether the weight member was loose or the concave portions were cracked. The club head was a wood type golf club head having a volume of 460 cm 3 made of a titanium alloy (Ti-6Al-4V) except for the weight member. The basic shape is as shown in FIG. The concave portion and the concave groove were formed at the same time when the head body was precision cast by lost wax. The thickness of the sole base was unified to 1.1 mm. Moreover, the screw hole of the recessed part was formed after casting.

  The weight member is made of WN sintered metal having a specific gravity of 14.5, and has a head portion and a screw portion as shown in FIG. The outer diameter of the head was 12 mm, the crest diameter of the screw shaft was 5.0 mm, and the total weight was unified to 8 g. Furthermore, the center of gravity of the weight member was set at a position of WGL / L = 067. The weight member was screwed into the concave portion of the head main body, and an adhesive was used in combination with the screw groove. A room temperature curable adhesive DP-460 manufactured by Sumitomo 3M Co. was used as the adhesive.

  Further, as a comparative example, a club head (not shown) in which the concave groove was removed from FIG. 4 was prepared, and the performance was compared. Details of the test are as follows.

<Loosening test of weight member>
First, the same shaft made of FRP was attached to each test head to make a 45-inch wood type golf club. Next, a machine test was performed in which each club was attached to a swing robot and a golf ball (“XXIO” (registered trademark) manufactured by SRI Sports) was hit with a head speed adjusted to 40 m / s. . Then, every time 100 balls were hit, the looseness of the screw shaft portion of the weight member was confirmed, and the number of hit balls where the looseness occurred was recorded. The maximum number of hits was 10,000. “◯” in the table indicates that there was no looseness.

<Crack resistance test for recesses>
A machine test was performed on a club that had not been loosened by the loosening resistance test of the weight member, and a machine test was performed using a newly prepared club. The machine test was performed by hitting the above-mentioned golf ball at a head speed of 50 m / s. went. Each time 100 balls were hit, the presence or absence of cracks in the peripheral area of the recess was confirmed with the naked eye from the head outer surface side, and the number of hit balls in which cracks occurred was recorded. “◯” in the table indicates that there was no crack.
Table 1 shows the test results.

  As a result of the test, the club head of the example had a high loosening resistance performance of the weight member, and showed a good result in the crack resistance test, confirming the significant effect of the present invention.

It is a perspective view of a head in a reference state showing an embodiment of the present invention. FIG. It is a side view of the head seen from the toe side. FIG. 3 is a bottom view of FIG. 2. (A) is AA sectional drawing of FIG. 4, (B) is BB sectional drawing of FIG. (A) is CC sectional view taken on the line of FIG. 4, (B) is sectional drawing of the ditch | groove which is not included in this invention. It is a principal part enlarged view of FIG. (A)-(C) are sectional drawings which show other embodiment of a ditch | groove. (A) is the bottom view of the club head which shows other embodiment of this invention, (B) is the DD sectional view taken on the line. It is a bottom view of the club head which shows other embodiment of this invention. It is a bottom view of the club head which shows other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Golf club head 2 Face surface 3 Face part 4 Crown part 5 Sole part 6 Side part 7 Hosel part 8 Recessed part 8a Tapered hole part 8b Same diameter hole part 8c Screw hole part 9 Weight member 9a Screw shaft part 9b Head part 10 For reinforcement Groove 10A First groove 10B Second groove 10i First end 10o Second end Z Recess peripheral area

Claims (7)

  1. A face portion having a face for hitting a ball on the front surface;
    A golf club head including a sole portion connected to a lower edge of the face and forming a bottom surface of the head, and a hollow portion provided therein,
    The sole portion is provided with a concave portion for fixing the weight member recessed to the hollow portion side, and a weight member fixed to the concave portion,
    A golf club head, comprising a reinforcing groove extending in a peripheral area of the recess within 10 mm from the recess.
  2.   The golf club head according to claim 1, wherein the concave grooves are provided apart from each other without communicating with the concave portions.
  3.   The golf club head according to claim 2, wherein a shortest separation distance between the concave portion and the concave groove is 1.0 to 10.0 mm.
  4.   4. The golf club head according to claim 2, wherein a shortest separation distance between the weight member and the concave groove is 1.0 to 10.0 mm.
  5. The concave groove includes at least a first concave groove and a second concave groove,
    In the reference state where the head is grounded to the horizontal plane at the specified lie angle and loft angle,
    A straight line connecting a first proximity point that is closest to the concave portion of the first concave groove and a second proximity point that is closest to the concave portion of the second concave groove is 5. The golf club head according to claim 1, wherein a projected straight line projected onto a horizontal plane intersects with a projected weight member obtained by projecting the weight member onto a horizontal plane.
  6.   6. The golf club head according to claim 1, wherein the groove has a groove length measured along the groove center line of 15 mm or more and an opening width of 1 to 10 mm.
  7. The concave portion is a circular hole, and a tapered hole portion extending toward the hollow portion while the inner diameter gradually decreases from the outer surface of the sole portion, and the concave portion connected to the tapered hole portion and extending with substantially the same inner diameter. And coaxially including a diameter hole portion and a screw hole portion continuous with the same diameter hole portion and formed with a thread groove having a smaller diameter than the inner diameter of the same diameter hole portion,
    The weight member includes a screw shaft portion screwed into the screw hole portion, and a head portion having an outer diameter that is connected to the screw shaft portion and engages with a step between the same-diameter hole portion and the screw hole portion. Including
    The golf club head according to any one of claims 1 to 6, wherein the head is housed closer to the hollow portion than the outer surface of the sole portion.
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